<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="index03.php" method="post">
    User_id: <input type="text" name="user_id" />
    Content: <input type="text" name="content" />
    <input type="submit" value="插入" />
</form>
</body>
</html>